Frequency if adjacent cell not blank

I need to get the number of unique "thk" values if the "count" value is not blank.  In the example below I am expecting a return value of 3.  How can I do this?

thk      count
0.118      1
0.118      2
0.118      
0.394      2
0.394      
0.236      
0.5      
0.25      2
 frequency.xls
munch007Asked:
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barry houdiniConnect With a Mentor Commented:
sorry, attachement not attached - here it is

barry
frequency-barry.xls
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barry houdiniCommented:
One way is to use this formula

=SUM(IF(FREQUENCY(IF(B2:B10<>"",IF(A2:A10<>"",MATCH(A2:A10,A2:A10,0))),ROW(A2:A10)-ROW(A2)+1),1))

confirmed with CTRL+SHIFT+ENTER

see attached

regards, barry
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